They do sell them in flight (internationally) but I Think its Herpa the last time I saw. I dont know about big scale ones like 1:200 etc.

Shop in BKK? hehe, if you want to buy lots of Gemini Jets, Dragon Wings, Herpa, Starjets, some snap fit 1:100 scale models, go to MBK Center, forget the name, but its like on 2nd floor, it has huge display in tiny store, but lots ot pick from even airport buildings you can buy for making an airport

There Are Those Who Believe That There May Yet Be Other Airlines Who Even Now Fight To Survive Beyond The Heavens